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Misfire

129 Views 4 Replies Latest reply: 2025-02-26 23:13:39


  •   Level 2   
    (11) points
    Steve
    2025-02-23 23:27:36
    Connected MaxiCOM mk808bt to my 2019 F150 checed for misfire and noted cyl#6 had a constant misfire. I tried again and misfire is no longer listed in the ECU or active test. what am I doing wrong?

    Tags: MaxiCOM , 808bt

    Reply

  •   Level 9   
    (6345) points

    2025-02-24 09:21:45 (Reply to:Steve)

    Hi, does your engine noticeable shudder or runs it fine,when you have a code 0306
    (misfire cyl.6) you must feel this when the engine runs, check if the obd connection
    was done correctly.
    Reply

  •   Level 2   
    (11) points
    Steve
    2025-02-25 22:48:52 (Reply to:)
    Yes it has a stumble or shutter seams like every 30 seconds the rpm would dip below
    500 and sometimes the engine will stall before it catches itself then it runs fine untill
    30 seconds then it starts to miss again..No codes. Plugs have been replaced. Since
    the coils have been mixed up, I wanted to see if # 6 is still missing or another cyl. but
    cant read any missfire information.

    Reply

  •   Level 9   
    (6345) points

    2025-02-26 11:51:56 (Reply to:Steve)

    Hi, than check the fuel pressure and the connector on injector 6 ,also check the hose
    connection from the maf sensor. Also check for cracked or loose vacuum hoses
    causing a lean mixture that can give misfires.
    Reply

  •   Level 2   
    (11) points
    Steve
    2025-02-26 23:13:39 (Reply to:)
    Thank you for your input. I will check the MAF hose and clean it.
    Reply
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